How do I resize for proper display on a NTSC DVD player.

[cobo]

I have some avi's and mpeg1's that when doubled in size come out 704 x 480. I want to combine them with some other video encoded at 720 x 480 on a single DVD. Do I need to add 8 pixel left and right borders to the 704 x 480 avi, or resize it to 720 x 480 for correct display on a standalone DVD player. I'd be using QuEnc to re-encode set to 4:3 aspect ratio.

[525/60]

Assuming your avi file has a 1:1 aspect ratio for viewing from your computer, the width of the video frame must be stretched wider by a ratio of 11:10 to make a 4:3 NTSC DVD. This ratio is effected with a 352x240 --> 726x450 transformation. So the script should look like this:

Spline36Resize(726,450)
Clip(2,2,720,448)
AddBorders(0,16,0,16)

Or if the original avi was not resized correctly to begin with, you might need to stretch it wider by a ratio of 9:8. A 352x240 --> 726x440 transformation would do the trick. And the script would look like this:

Spline36Resize(726,440)
Clip(2,0,720,440)
AddBorders(0,20,0,20)

Or you might simplify and split the difference:

Spline36Resize(720,440)
AddBorders(0,20,0,20)

Any of these are so close you probably can't tell the difference.

[525/60]

On second thought, I think I like this the best:

Spline36Resize(724,448)
Clip(2,0,720,448)
AddBorders(0,16,0,16)

[Mug Funky]

avi's and mpeg1's that when doubled in size come out 704 x 480

meaning the original was CIF size (352x240), like VCDs.

704x480 = D1 cropped, so all you need do is add 8 pixels to each side.

addborders(8,0,8,0) should do it.

btw, so long as the 720 and 704 video isn't joined together, you can safely put 704x480 on the DVD. you can even demux your mpeg-1 assets at 352x240 and put those on the DVD - all those sizes are DVD compliant (provided 352x240 is in MPEG-1)

[cobo]

Gspot and FitCD both say to resize to 704x480 and pad each side with 8 pixels for the mpeg1's. FitCD recommends the same rezizing for the avi's.

All the clips are captures from TV. I tried encoding them all ways. It's hard to tell the difference, maybe because they're animation, but the resizing to 720 looks best to me. A couple of the mpeg1's are PAL VCD format (352x288), but they also look best to me when they're resized to 720x480.

[525/60]

Gspot and FitCD both say to resize to 704x480 and pad each side with 8I assure you that 704x480 and 720x480 are both according to spec and both are in the same aspect ratio for DVD. If your file was originally from a VCD and is in mpeg1 4:3, then then doubling it and re-encoding it to mpeg2 is 4:3 DVD compliant. If it is a divx file and it is truely in 1:1 apsect ratio, Then my last post is your best answer.

Furthermore, I trust Mug Funky's statement that an mpeg1 file with a 352x240 frame size is DVD compliant. It makes sense based on the fact that most DVD players can play VCDs and mpeg1 is probably backward compatible with the mpeg2 chip in a DVD player. As long as you keep straight that 352x240 needs to be coded as an mpeg1 file and 704x480, 720x480, and 352x480 need to be coded as mpeg2 files, I think you'd be alright. But if it was a VCD, then it would be less than 730 MBs and copying it onto a blank DVD would be a waste of space if you know how to make a VCD.

You should have given more information on what type of file it is by now. You'd get better help that way.

Check out this link and the links cited at this link for what I consider to be the difinitive information on DVD aspect ratios:

[3.5] What's widescreen? How do the aspect ratios work? (http://www.dvddemystified.com/dvdfaq.html#3.5)

I should have mentioned right up front that I have made a 704x480 DVD with the same pixel aspect ratio as a 720x480 DVD. It looks exactly the same. The extra line width isn't viewable on a TV anyway, so why waste the extra space on a DVD?

[525/60]

All the clips are captures from TV.OK, I missed that it was a capture. Then doubling it to 704x480 mpeg2 and creating a DVD from that is the best option. Resizing to 720x480 would stretch the image too wide and cut off the sides of the image when viewing it on a TV.

Stephen